aiyo weightlifting mana ada macam ni punya.

if you can do 12 reps in 1 set it means that THE WEIGHT IS TOO LIGHT.
ideally you should use a weight that allows you to do 5 reps.
but when you are advanced the numbers change slightly.......

sad when I was a general worker my best was 1024kg (1 metric ton) in one hour up 4 flights of stairs, 50kg lift on to the shoulder and walk each time.

My mad colleague matched me. We pushed each other.

We were really really really tiny then. Absolutely devoid of volume since we only comsumed basic cap fan and a light snack with a drink for tea breaks.

This is exactly the problem. Poor communication. We are not grammar police here but, certain habits need to be curbed for public courtesy sakes. You can slurp your noodles loudly as much as you want at home alone, but please for god sakes, do not do it in the public. Just like using "..." throughout your sentences. Once or twice is enough. You can always use commas or fullstops.

If I could guess, your idea of a weightlifting workout is akin to a math calculations.
That means, if you lift 1kg and do 110 times (110reps x 1kg) you would have equaled someone who did 110kg x 1 rep.
Sadly, it doesn't work like that.

Lifting too light of a weight only activates your utility muscles (some will call it "outer muscles.")
By either lifting heavy or properly "squeezing" your muscles, you will only get to activate your inner or deep tissue to make them grow.

Btw, on the subject of this thread "Heavy Weight VS Full Range of Motion," I do not think that its a case of one or the other. "Heavy Weight," is required for muscle growth and Full range of Motion is required for muscle shape like increasing muscle length or if it is a compound exercise, it is required to activate other muscles. The short movement range (for certain exercises) are required for pumps. Most notably the bicep curl example; for larger biceps, you will need a full range curls and for the bicep peaks, you need to work on the pump.

As far as heavy weight (the reason I quote unquote them earlier,) as you will have millions of references throughout this forum and others, its a matter of progressive. One will not be wise to judge a weight as heavy or not for him/her self without properly assessing their progress or ability. The worst one can do is comparing against other people.

This is a quote from Kai Green to take to heart.

"We are not weight lifters. We are body builders."

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